Jambs s



UNITED STATES PATENT OFFICE.

JAMES s. ATKINSON, or PITTSBURG, PENNSYLVANIA, ASSIGNOR 'ro .IoNEs &

LAUGHLINS, (LIMITED,) OF'SAME PLACE MANUFACTURE OF ROLLS.

SPECIFICATION forming part of Letters Patent No. 364,157, dated May 311887. 7

Application filed February 3, 1887.

casting the same in molds formed either ofsand or metal. The roll isthen turned or ground downto the desired shape and size.

I This method is objectionable, not only on account of the labor,difficulty and expense of forming the mold and turning down the roll,the frequent formation of flaws and blow-holes, which are onlydiscoverable when the roll is in use, but also on account of thetransverse weakness of rolls having no internal defects.

The object of the invention herein is to so construct both plain andgrooved rolls for the reduction of metals that they shall have not 2only a greater transverse strength, be more easily and cheaply made, butshall also be stronger and more durable.

In the practice of my invention I cast an ingot, either of Bessemer,open-hearth, or cru- 0 oible steel, of a length approximately equal tothe length of the roll to be formed, and of a transverse areaconsiderably larger than that desired in the finished roll. Thisingot,which may be either square, round, or of any other desiredtransverse section, is then reduced, either by rolling or forging, or byrolling and forging, to approximately the size of the finished roll. Thenecks and wabblers are then formed on the ends of the shaped ingot or 0forging, which is then transferred to a lathe,

where it is turned or ground to the finished s1ze.

In making grooved rolls the grooves may be partially formed by forging,and then fin- Serial No. 226,468. (No specimens.)

ished by cutting orgrinding, or, and preferably, they may be formedentirely by cutting or grinding.

In this method of manufacturing rolls any flaws or blow-holes which mayoccur in the ingot during casting are closed or filled up by the rollingand forging operations to which the ingot is subjected. In addition tothe avoidance or obliteration of flaws and blowholes, as above stated,the rolling and hammering produce such density and compactness 5 5 ofmetal as to prevent the formation of what is termed surface-cracking-adefect incident to cast rolls. By this method of forming rolls I amenabled to produce a surface which shall be nearly, if not quite, ashard and dense as the surface of a chilled roll, and am enabled to avoidthe brittleness and transverseweakness necessarily consequent upon thesudden chilling of cast metal.

Care should always be taken that the ingot, 6 5 whatever its sectionalcontour, should be of such transverse sectional area as to requireconsiderable working to bring it to approximately the size of thefinished roll, in order to closing up of internal flaws and blow-holes.

I claim herein as my invention- 1. As an improvement'in the art offorming rolls for the reduction of metals, the hereindescribed method,which consists in rolling or 7 5 forging an ingot to approximately thesizeand shape of the desired roll, and then cutting or grinding suchforged ingot to the desired size and shape, substantially as set forth.

2. As a new article of manufacture, a forged or rolled steel roll forthe reduction of metal, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JAMES S. ATKINSON.

Witnesses:

DARWIN S. WOLCOTT,

R. H. WHITTLESEY.

obtain a dense and compact surface and the 7

